PUBLISHED: 22:25, Sat, Sep 19, 2020 | UPDATED: 22:25, Sat, Sep 19, 2020
The package was found to contain ricin and is believed to have come from Canada. It was intercepted at a US government mail facility and did not reach the White House, according to American media reports citing a federal official briefed on the matter.
The White House and US Secret Service have so far declined to comment.
Asked about the reports, the FBI said the agency and "US Secret Service and US Postal Inspection Service partners are investigating a suspicious letter received at a US government mail facility.
“At this time, there is no known threat to public safety."
Ricin is found naturally in castor beans but it takes a deliberate act to convert the substance into a biological weapon.
Donald Trump was sent a package containing the deadly poison ricin (Image: GETTY)
The President speaks at a campaign rally in Minnesota on Friday (Image: GETTY)
If exposed to even the tiniest amount of the poison a person can die within 36 to 72 hours.
There is no known antidote.
In February 2018 the president’s former daughter-in-law was rushed to hospital after opening an envelope containing suspicious white powder.
READ MORE: Northern Ireland to start building Brexit port checkpoints
Donald Trump is gearing up for the November 3 election (Image: GETTY)